public  class Circular {
    Circle bottom;
    double height;
    void setBottom(Circle c) {
	bottom = c;
    }
    void setHeight(double h) {
        height = h;
    }
    double getVolme() {
        if(bottom == null)
	    return -1;
	else
	    return bottom.getArea()*height/3.0;
    }
    double getBottomRadius() {
	return bottom.getRadius();
    }
    public void setBottomRadius(double r) {
	bottom.setRadius(r);
    }
}
